M eta l l



Hon F, formed by :i Told of he metal adjacent said nailing-strip, :nul n. ffurrospmul V-Slmped rib m: projwnu G mx xhe opposite scribed.

ion G being gwovidod with ab mxgular hwk JNO. TRIMBLE,

end f, whvreby The ribs :we crmSed 10 bind l J. II. THOMPSON.

when slipped together and straightened um; ng 01x the sheathing-boards, Subsl'mltmlly as delo 

